Taxon Report

Dudleya densiflora (Rose) Moran

San Gabriel Mountains dudleya

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Taxon Summary

Dudleya densiflora, commonly known as San Gabriel Mountains dudleya, is a perennial herb in the Crassulaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Coastal scrub, Lower montane coniferous forest, and Riparian woodland, growing at elevations from 244 to 610 meters. Dudleya densiflora is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

  Classification
Scientific Name:
 Dudleya densiflora (Rose) Moran
Common Name:
 San Gabriel Mountains dudleya
Family: Crassulaceae
Element Code: PDCRA040B0
USDA Plants Symbol: DUDE2
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial herb
Blooming Period: Mar-Jul Mar-Jul
Elevation: 244-610 (800-2000)
General Habitats: Chaparral, Cismontane woodland, Coastal scrub, Lower montane coniferous forest, Riparian woodland
Microhabitat: Granitic
Microhabitat Details: cliffs and canyon walls

Conservation Status
CA Rare Plant Rank: 1B.1
Global Rank: G2
State Rank:
 S2
State List: None
Fed List: None
Other Status: SB_CalBG/RSABG; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 9
Element Occurrence Ranks:
   Excellent (A) 1
   Good (B) 3
   Fair (C) 1
   Poor (D) 0
   None (X) 0
   Unknown (U) 4

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Los Angeles (LAX)
Quads: Name (Quad Code)
Azusa (3411728), Crystal Lake (3411737), Glendora (3411727)

Threat List Data from the CNDDB

Threat List Total: 5
EOs with Threat Listed: Total EOs % of EOs
5 56 %
Mining 4 44%
Over-collecting/poaching 3 33%
Recreational use (non-ORV) 2 22%
Road/trail construction/maint. 1 11%
Improper burning regime 1 11%

Notes
Known only from six extant occurrences. Threatened by mining and development. Possibly threatened by horticultural collecting.
Threats:
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 15 February 2025].